I understand, sounds for sure like you are on the right track and need to change that slave cylinder.
Boy, I know how it is to not realize you should have done something like that and end up having to do a job twice over it.
Let me tell you this, IF you are pulling the transmission out again right now for the slave, I encourage you to get a Torsen LSD and install it.
Look how much you've already paid, and you don't want to have to pull this trans out again right? You like to drive your car and drive it hard. You will probably end up needing a differential again some time.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black